Pulley.



PATENTED DEC. 25, 1906.

A. JOHNSTON.

PULLEY. APPLICATION FILED SEPT. 7.1904.

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,0 wheel I ma "-next step W i TED STATES PATENT OFFICE.

ALLEN JOHNSTON. OF OTTUMWA, IOWA.

PULLEY.

- 5 tion is ful y set forth in the following specification.

I This invention relates to improvements in ball-bearing wheels,pulleys, or rollers for sheaves, sash-pulleys, doorhangers, andHer'etofore' such wheels or rollers, when formed of sheet metal, havecommonly been made of two disk-like parts or halves secured together byrivets or otherwise. When subjected to-heavy ressure or I 5 strains, theparts frequently brea apart.

My object is to overcome this difliculty and to provide ball-bearingwheels or rollers' of minimum cost and maximum strength and durability;also, to provide for maximum 20 ball-bearing surface relative to thediameter of the wheel 'or roller.

The invention may be readily understood by reference to the accompanyingdrawings, 'wherein 'Fi es 1 and 5 illustrate blanks from whic parts ofthe 'wheel may be formed. Figs. 2, 3, and 4 illustrate different stepsin the formation of the rim of the wheel. Figs.

6, 7, and 8 illustrate steps in the formation of 30 the innerball-retaining ring .of the wheel.

Fig. 9 is a sectional view, and Fig. 10 a side elevation, showing 'theparts secured toether to forms. com leted wheel. is an elevation, andFig. -12 a'sectional view,

3 5 of a sheave or pulley in which the wheel shown in Fig. 9 1s used.Fig.-15 shows the rim and ring in relative position before they aresecured together" In forming the outer grooved rim of the start eitherwith the flat sheetmetal blan. 15 or with the short tubular blank 16.ifhen blank i5 is utilized, it is first drawn or shaped into the form ofa cup, Fi 2, having a bottom 17 and a flared open forming a peripheralflange 18., By the of the process the bottom 17 is out or otherwiseremoved, as shown stamped in Fig. 3, leaving aslightly-mturned annularSpecification of Letters Patent. Application filed September 7, 1904-Serial No. 223,647-

Patented Dec. 25, 1906.

18 and 20, separated in a peripheral groove 22, in whicha sash-cor,track, or other coop-' erating part is adapted to engage. As shown,therim 1s webless and spokelessi. e., there. is no portion or spokesextending inwardly from its inner convex surface. Fewer steps arerequired to form this rim from the tubular blank 16 One or two formingsteps suffice to turnupthe'flanges 18 and 20 at opposite ends of theshort length oft-ubing. The inner trough-like ring for engaging thebearingballs may be formed either from the circular sheet-metal blank orthe short tubular blank 26, Fig. 5. When the former is utilized, it isfirst drawn or shaped to .form the cup of Fig. 6, having bottom 27. Theedge of the'cup is then turned inward to form a an 'e 28, Fig. 7 Bottom27 is then removed and inturned flange 29 (similar to 28) formed. Theseoperations result in the continuous seamless annulus or ring formed of asingle iece of metal and having inturnedball retaimng and en agingflanges 28 and 29.

The rm 30, (shown in Fig. 8,) is next inserted in t e rim of Fig. 4, inwhich it closely fits, as shown in Fig. .15. The ring is now spread orex anded, particularly at its edges, until its wal assumes a sha ecorresponding to the inward convexity of t e rim, as clearly shown inFig. 9. Peripheral ribs and 41 are thus formed. They are of greaterdiameter than the smallest diameter of-the rim,

and hence bind the rim and inner ring together. In this manner the twoparts of the wheel are rigidly and securely fastened to-. gether withoutthe use of rivets or solder.

older, rivets, or other means of securing these (parts together may,however, be em-r plolye a he sheave or ulley shown in Figs. 1 1 and12comprises aw eel:such as shown in Fig. 9, andtwo plates 32 and 33,rigi ly connected by a bentfover flange 34 and so shaped as to provide agrooved annular ball-raceway 35. too

36.represents'bearing-balls o crating 'in'said racewa 35 and in thetroug-like innenring 30 of t e wheel. The flanges .28 andflli) of said ringhold the wheel in proper operative flange 16.; The article of Fig. 3 isthen fur 5c ther drawn, sws 'ed, or shaped. to turn the, flange outward?,forming a second peripheral flange 20%;simi ar to flange 18, said flanes bei connectedby aficoncave wall 21'. 'lhe 're'su t of theseoperations is a continuous- 5 5 annular seamless rim formed of a singlepiece of metal and having sideguide-flanges' rim and its flanges beingstrain upon the wheel, many more balls can 7. A wheel or pulley havin aperiphe be employed, with corresponding increase in rally grooved rim, aring fitting c osely Wlthin bearing-surface, the more durable andsmoothness of 0 eration, and a smaller wheel can be employed for heavierwork.

Modifications may of course be made within wide limits without departingfrom. the nature and principle of the invention.

at I claim is v 1. In a wheel or pulley, a continuous'webless seamlessrim having ing integral flanges at its opposite ed es in combinationwith an inner ring fitting c osely peripheral ribs engaging on Withinsaid rim.

2. In a Wheel or pulley, less seamless rim having ing integral flangesatits a continuous webopposite edges, said formed of a single piece ofsheet metal, in combination with an inner .continuous seamless ringfitting. closely Within said rim.

3. A Wheel or pulle having a continuous seamless rim providecl withoutwardly-projecting integral flan es at its opposite edges, and aninner rin 'tting closely within the rim and provide with inwardy-projectingi integral flanges at its opposite edges.

4. A Wheel or pulley havinga continuous seamless rim provided withoutwardlyr0 jecting integral'flanges at its opposite e ges, and an innercontinuous seamless ring fitting closely within the rim and providedwith inwardly-projecting integral flanges at its opposite edges.

5. A Wheel or pulley having a continuous seamless rim provided withoutwardly-projecting integral flanges at its opposite edges, said 'rimand its flanges being formed of a sins gle piece of sheetmetal and aninner continuous seamless ring fitting closely and secured within therim and provided with inwardlyprojecting integral flanges at its 0posite edges, said ring and its flanges being ibrmed ofa single piece ofsheet metal.

6.- A wheel or pulley. having a rim, and a ring fittin within the rimand provided with periphera ribs engaging on opposite sides of a portionof the rim of smaller diameter than the ribs, whereby the rim and ringare held together.

pulley is much stronger, lasting, there is greater Ling flanges aroundopposite'edges of the ring l and peripheral. ribs 1 tinuous seam essoutWardly-projectl and provided outwardlyproject: I

the rim and provided with inwardlyeprojectengagin sides of a portion'ofthe rim'o eter than the ribs, are held together.

on opposite smaller diam- 8. A wheel'or pulley having a continuousgrooved rim, a confitting within the rim seamless. peri 'herally ringwith inwardlfy projectin flanges around opposite edges t a portion ofthe rim of smaller diameter than the ribs, whereby the rim and ring arehfeld together. .9. Awheel orpulley having a continuous seamlessperiphera ly-grooved rim made of a single piece of metal, a continuousseamless ring made of a single iece of metal and fit-' ting within therim an having inwardly pro- 'jecting flanges around its opposite edgesand peripheral ribs engaging on opposite sides of a portion of the rimof smaller diameter than the ribs,'whereby the rim and ring are heldtogether, said flanges and ribs being integral parts of the ring.

10. A Wheel or pulley having a continuous seamless -r1m made ofa singlepiece of metal,

whereby the rim and ring he rin "an opposite s'i eso'f a continuousseamless ring comprising in- I wardly-projecting side flangesconnectedby a concave Wall closely engaging an inwardly.-

'conveX wall of the rim, thereby securing the 8 rim and ring to ether. i

11. The com ination with a wheel having a continuous seamless rimsecured withinthe rim and formed with integral inwardly-bent ballretaining and guiding flanges'at its opposite edges, of a gang ofbearing-balls engaging the inner surface of the rin. for sai balls. v

' In testimony whereof I have signed this specification in the presenceof two subscrib'- ing witnesses. l

' Witnesses:

I and a concentric: continuous seamless ring fitting closely and vbetween said flanges, .anda support 9s ALLEN JOHNS-TON;

